libstdc++: Warn if __STRICT_ANSI has been undefined

Recent changes to use __int128 as an integer-like type in <ranges> and
to optimize std::uniform_int_distribution mean that the library relies
on __int128 more heavily than in the past.

The library expects that if __int128 is supported then either
__GLIBCXX_TYPE_INT_N_0 is defined (and we treat is like the standard
integer types), or __STRICT_ANSI__ is defined (and we need to add
special handling for __int128 as a non-standard integer type).

If users compile with -std=c++NN -U__STRICT_ANSI__ then it puts the
library into a broken and inconsistent state, where the compiler doesn't
define the __GLIBCXX_TYPE_INT_N_0 macro, but the library thinks it
doesn't need special handling for __int128. What the user should do is
compile with -std=gnu++NN instead.

This adds a warning if it appears that __int128 is supported but neither
__GLIBCXX_TYPE_INT_N_0 nor __STRICT_ANSI__ is defined.

libstdc++-v3/ChangeLog:

	* include/bits/c++config: Warn if __STRICT_ANSI__ state is
	inconsistent with __GLIBCXX_TYPE_INT_N_0.

diff --git a/libstdc++-v3/include/bits/c++config b/libstdc++-v3/include/bits/c++config
index 155d0f46b165cb9d49f547d81392ac85ead32300..cd7678eb16d48260abfb74e60c5bfc59ecab0b4f 100644 (file)
--- a/libstdc++-v3/include/bits/c++config
+++ b/libstdc++-v3/include/bits/c++config
@@ -524,6 +524,15 @@ namespace std
 
 #define _GLIBCXX_USE_ALLOCATOR_NEW
 
+#ifdef __SIZEOF_INT128__
+#if ! defined __GLIBCXX_TYPE_INT_N_0 && ! defined __STRICT_ANSI__
+// If __int128 is supported, we expect __GLIBCXX_TYPE_INT_N_0 to be defined
+// unless the compiler is in strict mode. If it's not defined and the strict
+// macro is not defined, something is wrong.
+#warning "__STRICT_ANSI__ seems to have been undefined; this is not supported"
+#endif
+#endif
+
 #else // !__cplusplus
 # define _GLIBCXX_BEGIN_EXTERN_C
 # define _GLIBCXX_END_EXTERN_C